Error uploading files! HELP

While trying to upload certain files to a FTP MVS running Z/OS Server there are certain error that appears.

Some of them are 501 command aborted -- FTP server not configured for SIZE and 501 command aborted -- FTP server not configured for MDTM . For some reason using another FTP client the uploading is a success, but when using SmartFTP Client, latest version, this error occurs. I will post the error log in here, but all of the files and ips will be erased for security reasons. Any help will be appreciated.